----Do you know_____ second-hand smoke? ----To prevent our health and memory.
A. how we should prevent B. how we should prevent
C. why we should prevent D. whether we should prevent
---- Will you buy this tie for Dad?
---- I have no idea. I don’t know or not the colour matches his new shirt.
A. if B. that C. why D. whether
The child is too young to_________ himself．
A．wear B．put on C．dress D．dress up
You can never imagine what great difficulty I have _________ your house.
A. found B. finding C. to find D. for finding
----I wonder if your father _______ you to go swimming.
----I’m not sure. But I will tell you if he _______ to let me join you.
A. will allow; will agree B. allows; agrees
C. allows; will agree D. will allow; agrees
The book will ______ you when you need help.
A. help to B. be some helpful with
C. be of some help to D. be of some help with
